Mold and mold-lining.



CROSS REFERENCE E. G. ACHESON. MOLD AND MOLD LINING.

APPLICATION FILED DBO. 13, 1904.

J 'i i glww we ,y tv.; y *3'3" Ksmm 1Q 4 witnesses PATENTED MAR. 10, 1908.

i nvefntoz flltozmzip ExAMmER.

30 sodium silicatehaving a specific gravity of 1.10, in suflicient proportion to produce a.

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unirsi) sums-PATENT osnicnf EDWARD GOODRICH ACHESON, OF S'IAMFORDV TOWNSHIP., WELLAND COUNTY, ONTARIO. CANADA.

HOLD AND MOLD-LINING.

To all whom 'it may concern:

`Be itknown that I, EDWARD GooDRIcH i AoHEsoN,- a citizen of the United States, re-

' ments in Molds and Mold-Linings, of which the following is a specification.

This invention is a permanent non-metallic mold for the production of metal castings:

The mold or mold lining consists of a porous mass of particles of siloxicon cemented together by a permanent binder, for example sodium silicate.

The mold may have a gate of yielding material such as green sand, or an inwardly-flaring gate, to permit inward movement of the sprue, as the cast metal contracts on cooling. As a concrete illustration of the invention a pulley mold has been shown in thel accompanying drawing, thev view being an axial section.

The mold comprises a siloxicon cope and.

dra 1, 2, agreen sandgate 3 and a baked san core 4. The gate is supported in a reJ cess 5 in the co e and the core 1s supported in arecessint edi-ag.

In constructing/the' improved mold, siloxicon is crushed, referably to pass a 20-mesh sieve, and mixe with an aqueous solution of mixture having about the consistency of ordinary molding sand. The mixture is then molded by hand or machine, being tamped or com ressed around the pattern, and the mol or mold sections are baked at a sufficient temperature to substantially eliminate the moisture, as in a core oven. The particles of siloxicon are thereby rigidly cemented together and the product is a porous, permanent mass. l

If desired, the mold may be vented before it is baked b the use of venting wires, or a combustible ingredient such as sawdust may (bie mixed witth tllile skilolgn and burned out uring or a er.t e

For the roduction of es ecially smooth castings, it 1s desirable to ma e the inner portions yof the walls ,of the mold of finer particles of siloxicon than those which are used 'for the body of the mold. It is also desirable,

` before making the first casting, to brush the Specification of Letters Patent. Application led December 13, 1904. Serial No. 236,672/

Patented March 10.11908.

ound Elumbago, to ering to the inner mold surface with prevent the cast metal om.ad sodium silicate.

vA mold produced by the described process may be used Without injury for the production of an indefinite number of castings. The -castings may be, and refera'bly are, cast in rapid succession, there y maintainin the mold at a high temperature. The mol may advantageously be used for the pro- `duction of solid steel ingots.

Physically lconsidered, the mold is strong, porous and refractory, and has a hard, smooth surface to which iron' does not adhere. The material is of low heat-conductivity, giving soft castings, and has a low coefficient of`expansion, avoiding strains in the castings. Chemically considered, the mold is inert or neutral. The material does not dissolve in or chemically modify castings of -iron or steel, as do molds of carbon.-v

Instead of using a te orary gate of sand or other yielding materia a permanent gate may be molded directly in the siloxicon mass. wards to permit inward movement of the sprue as the cast' metal contracts.

The term siloxicon, as used in this specification, is intended to cover any compound containing silicon, carbon and oxygen, and the ex ression particles of siloxiconis intende to cover articles consist in whole or part of si ixcon. The sil- Such gate should preferably flare inoxicon mold of this application is to be distinguished from the brick, crucible or muiiie described and claimed in my Patent No. 722,793, granted March 17, 1903. .The

mold or mold lining is a porous, conglomerate mass'of discrete particles or fragments of siloxicon, cemented to ether by a permanent binder. The artic e of the specified patent is a dense, homogeneous massA of siloxicon, shaped by the use of a tempera binder such as glue-water and .fired at .suc

high temperatur.f that it is fntted into a body in which the particles directly cohere or coalesce. l

What I claim is:-.

' l1. The herein described mold comprising a porous body composed of crushed siloxicon the particles of which .are rigidly cemented together and from which the moisture has been eliminated.

` 2. The herein described mold oomprising In testimony whereof I have signed my a porous body composed of crushed siloxiname to this specification in the presence of con, the particles of which are rigidly cetwo subscribing Witnesses.

mented together and from which the moisture EDWARD GOODRIGH ACHESON. 5 has been eliminated, the said body having Witnesses:

low heat onductivity and a. low ooelcient HUGH M. STERLING, of expanslon. FRANK L. FREEMAN. 

